Improvement in auger-bits



to which my invention appertains to make and Unire Srarns ATENT OFFICE.,

JOHN C. MILLS, OE ROCHESTER, NEW YORK, ASSIGNOR TO HIMSELE AND RICHARDLEAKE,

IMPROVEMENT IN AUSER-BITS.

Specificationforming part of Letters Patent No. H l "2,063, datedFebruary Ll, 1871.

To all whom t may concern:

Be it known that I, JOHN C. MILLs, of Rochester, in the county ofMonroe, and in the State of New York, have invented certain new anduseful Improvements in Augerits; and I do hereby declare that thefollowing is afull, clear, and exact description thereof, referencebeing had to the accompanying drawings, and to the letters of referencemarked thereon, making a part of this specification.

The nature of my invention consists in the construct-ion and arrangementof an adjustable auger-bit, as will be hereinafter more fully set forth.

In order to enable others skilled in the art use the same, I will nowproceed to describe its construction and operation, referring to theannexed drawings, in whichd Figure 1 is a side view oi' my auger-bitcontracted to its narrowest limit. Fig. 2 is a view of the opposite sidethereof, showing the auger-bit expanded toits utmost limit, and Fig. 3is a section of the same.

A represents the shaft, provided at its lower end with the usual screwor auger, a. For a suitable distance above this lower end the shaft A isflattened, and on each side thereof is placed aplate or bar, B, pivotedat their upper ends by means of ascrew, b. Thelower ends of the bars B Bare formed, as shown, with a beveled cutter, d, having at its outer edgea downward projecting knife, e. The attened portion of the shaft A isslotted longitudinally for asnitable distance, and through the same ispassed a headed screw-bolt, f, which also passes through inclined slotsin the two bars B B, and upon the end of said bolt is placed a nut, h,provided with projections t on its under side. These projections areinserted in the slot on the bar B on that side, and prevent the nut fromturning.

The operation of this bit is readily seen. By loosening the bolt andsliding the same up or down in the slot on the shaft A, the jaws of thebit are expanded or contracted, so that the bit may be set for any-sizedhole desired to be made.

Having thus fully described my invention, I disclaim an extension-bitwith the adj ust-ingscrew passing longitudinally through the eutters andthe shaft; but

XVhat I claim as new, and desire to secure by Letters Patent, is-

The combination of the slotted shaft A, with its screw or auger a, theslotted plates or bars B B, with their cutters d d and e e,t11e screw b,and the bolt f, all constructed and arranged as described, and for thepurposes set forth.

In testimony that I claim the foregoing I have hereunto set my hand andseal this 16th day of December, 1870.

JOHN C. MILLS. [L s] Vitnesses:

C. L. EvnRT, Onlus GAFFIN.

